Air-cooled engines are a type of internal combustion engine that uses air to dissipate heat. Instead of relying on a liquid cooling system, these engines have fins or other structures that increase surface area, allowing air to flow over them and cool the engine components. This design is often simpler and lighter, making it popular in applications like motorcycles and small aircraft. One of the main advantages of air-cooled engines is their reduced maintenance needs, as they do not require coolant or a radiator. However, they can be less efficient in extreme temperatures, as they may struggle to maintain optimal operating temperatures compared to liquid-cooled engines.